Girls Underwear Size 6 Market Report: Sales Volume, Market Share, Leading Brands & Market Trends

Fruit of the Loom is the best-performing girls underwear size 6 brand in July 2026, moving 6,000 units across 2 ASINs for 31.6% of Top 10 volume. Hanes follows with 5,000 units (26.3%), ahead of Finihen on 3,000 units (15.8%).

With 6 brands splitting the Top 10 and 73.7% of volume sitting with three of them, this is a concentrated shelf — the leaders hold multiple listings or one very high-velocity ASIN, so a new entrant competes against established review moats rather than an open field. Average selling prices among the leaders run from $11.56 to $19.99, which frames the price band a competing listing has to justify.

Based on July 2026 data, this shortlist surfaces the two kinds of ASIN worth keeping an eye on — the ones that just broke into the Top 10, and the ones growing fastest month over month. Specifically, one ASIN forced its way in: B07PZC9CB5 booked 1K units at $14.99, with ▲ 0.0% MoM change. On the growth side, B0D614YH28 leads positive momentum with ▲ 400.0% MoM growth on 1K units, with B0BVGN7KLQ close behind at ▲ 300.0% MoM on 200 units.

The two signals carry different weight. A fresh entrant means share has already changed hands — an incumbent gave up its place to make room, so any competitive set drawn up a month ago is now out of date. A steep growth rate works as the earlier warning: it marks demand that is still compounding, usually a month or two before the ranking catches up to it.